About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

A diffractive grating is promising for color separation to effectively replace conventional absorptive dye color filter in liquid crystal displays. In this paper, we demonstrated a color separation module consisting of an aspheric-lenticular lens array and a blazed grating to substitute for the dye color filter. Each component was designed to match the recent fabrication ability of our roll-to-roll imprinting. The measurement results of a prototype module showed a gain factor of transmission efficiency three times more than that of conventional color filters.

Figures (14)

Schematic representation of a color display with the BCSG. The aspheric-lenticular lens array on top of the grating deflects and converges the incident light. A blazed grating separates the colors in different direction onto the appropriate pixels.

Illustration of the simulation results. Light from a high collimation backlight module is dispersed by the BCSG, and then deflected and converged by the aspheric-lenticular lens array to generate color separation.

To make the BCSG and the aspheric-lenticular lens array on a PET film, a mechanically grooved structure was first formed on an imprinting roller by using a diamond tool with the designed profile, as shown in (a).Then the UV resin was dispensed on the PET film, imprinted by the roller, and cured with UV source, as shown in (b).

(a) Color separation patterns of the module consisting of an aspheric-lenticular lens array and a BCSG by making use of RGB LEDs. (b)Color points in CIE xy space, created by sampling the line pattern shown in (a).